Actually there are reasons why high and low beams don't operate at the same time. When travelling at highway speeds with the high beams, adding the low beams lights an area that is basically irellevant. The bright spot from the low beams distracts from seeing to the limits of the high beams. Sure, it looks really bright, but all in the wrong place.
-------------------------------------------------------------- What you say makes some logical sense, but I personally haven't found the benefit of having all four beams operating while highway driving at night a distraction, or detriment at all.
With the better PIAA Lamps, (and careful alignment/aiming) I do see much better further down the road, and the benefit I feel I have gotten from also having the Low Beams on also, it that a wider swath/area is lit.
I notice a much better ability to see, and see a lot more when encountering curves, and turns, driving in mountainous areas, as I live in S New Mexico. I notice a much safer feeling having the ability to see more of the road, and shoulders. I'm not also concerned with seeing further down the road in front of me, but feel I have a much better advantage seeing critters like Deer, Coyotes, Antelope, etc better at night, who many times lurk off to the shoulders.
Perhaps as you say, with only the benefit/upgrade of a Hi-4 Kit, and not increasing candlepower of your Beams, there will be no benefit of seeing further down the road.
If I hold you to your philosophy, and let's say that "less is better", then a tiny pair of pencil beams would be better yet, no?
Please don't get me wrong here. Many vehicles made today DO come with adequate lighting straight from the factory. I'm not saying for everyone out there who owns a vehicle with 4 separate headlamps to rush out, and buy a Hi-4 Kit.
I honestly feel though that on my '97 Tahoe LT 4x4, this was one area that they could've done better on. The Lamp Housings themselves are not very big on these Tahoes, and the wattage output was IMO marginal, so the only way to supplement them without a very costly modification is with a slightly better, street legal lamp/Hi-4 kit. The other option would've been perhaps mounting a Brush Guard/Bar, and mouting auxilliary Lamps.
Every vehicle has its shortcomings, none are perfect in every regard. With this era of Tahoes/SUVs/Trucks, the other safety deficiencies were mushy, vague feeling, inadequate brakes.
I guess one cannot expect BMW-Mercedes performance, and quality for chevy prices.
The Brake upgrade was also another upgrade I performed on my Truck, with new Stillen Slotted Rotors, larger Stillen Front Calipers/Better Pads, and SS Brake lines throughout. It was a $1,000 upgrade at the time for the parts, but also feel this was worth it. Noticeably better when towing, and much less fade. Mark